[SOLVED] deleting parts of a string

[bond_006]

I'm trying to get my program to go through the string typed in by the user and strip it of EVERYTHING but the numbers. I can't place my finger on what I'm missing. Help please?

Code:

#include<iostream>
#include<string>
using namespace std ;

int main()
{
	string myString ;

	cout << "Please enter data: " ;
	
	getline( cin, myString ) ;

	// disgard anything that's not an int
	for ( int x = 0 ; myString.length() ; x++ )
	if ( !isdigit( myString[ x ] ) )
		myString.erase( x, 1 ) ;

	// display contents
	cout << myString << endl ;
} // end main

PS everything compiles ok, but I get a runtime error anytime I hit enter after entering any data.

[gerard4143]

I tried this and it appears to work...As you delete characters from your string it shrinks, so to correct for this --x.

#include<iostream>
#include<string>
using namespace std ;

int main()
{
	string myString ;

	cout << "Please enter data: " ;
	
	getline( cin, myString ) ;

	// disgard anything that's not an int
	for ( int x = 0 ; x < myString.length(); x++ )
	if ( !isdigit( myString[ x ] ) )
	{
		myString.erase( x, 1 ) ;
		--x;
	}

	// display contents
	cout << myString << endl ;
} // end main

[bond_006]

That solved it! I knew it was something small I was missing.

Thanks a bunch dude!